Behaviour of the two-phase permanent magnet synchronous motor supplied by rectangular voltage

Permanent magnet synchronous motors are attractive for domestic and industrial application due to several reasons. They are chemically inert, which makes them suitable for applications in aggressive environments. Strontium-ferrite magnets have high specific electric resistance, so they do not experience thermal problems due to eddy-current losses. Their low residual flux density permits the construction with high air-gap, what is needed for small pump applications, where the rotor of electric motor is exposed to water. But permanent magnet motors have some drawbacks. The most important of them is the inability to start directly on the mains. Permanent motor must be equipped with an electronic converter. The paper shows the analytical method to determine electric and mechanic quantities when motor is supplied by no harmonics voltage.